Addition to .gitignore

[kkrieger85]

Add files in var/**/* to .gitignore:

Proposal:

var/cache/*
var/locks/*
var/report/*
var/session/*

[Flyingmana]

maybe putting the .gitignore file directly into the var directory, to keep the one in the root a bit smaller.
also, wildcard does not ignore files starting with a ., so we also need .*